/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    height: 100vh;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
}

@media (max-width: 576px) {
    .main-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
    }
    
    .sidebar-nav ul {
        display: flex;
        flex-wrap: wrap;
    }
    
    .sidebar-nav li {
        flex: 1;
        text-align: center;
    }
}